(The BUY page where you chose the monthly plan, clearly states that the payment is a recurring payment that you can cancel at any time. The same information is also repeated on the page where you enter your credit card information. You are literally required to check a box agreeing that you understand the payment will be recurring before you can submit your payment. The information is also on multiple other pages, in the terms of use, and probably in the confirmation email you receive when you create an account.)